<!DOCTYPE html>
<html lang="en">
	<head>
		<meta charset="UTF-8" />
		<meta name="viewport" content="width=device-width, initial-scale=1.0" />
		<title>Document</title>
	</head>
	<body>
		<button>left</button>
		<button id="btn">right</button>

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		<script>
			btn.onclick = function () {
				var display = window.getComputedStyle(this).getPropertyValue('display')
				console.log(display)
      }
      
      function testReturn(){
       return console.log('这是console.log()')
      }
		</script>
	</body>
</html>
